I want to set up my steel hard tail (currently a pretty frame on the wall in the spare room) as a 1 x 9

I have an old set of RF Evolve cranks in the spart parts bin - I want to leave the middle ring on the crank spider, remove the big and small rings, remove the front mech and operate as a 1 x 9,

Given a reasonable chain line with the cassette, I can't see any issues with the above - will I need to get a specific chain ring? I can see advantages to getting a thicker middle ring without ramps and pins to increase longevity.

I may also need to get narrower chainring bolts.